Improvement in wrench



UNITED STATES PATENl FFICE.

GEORGE CVTAFT, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO'LORING COES, OF SAME PLACE.

IMPROVEMENT IN WRENCH.

Specification forming part ofLetters Patent No. 88,230, dated March 23, 1869.

Know all men by these presents:

That I, GEORGE C. TAFE, of the city and county of Worcester, and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Screw-Wrenches 5 and I do hereby declare that the following is afull, clear, and exact description of the same, reference being` had to the accompanying drawings, forming a part of this specification, in which- Figure l represents a side view of my improved screw-wrench, and Fig. 2 represents a longitudinal central section ot' the wrench shown in Fig. 1.

To enable those skilled in the art to which my invention belongs to make and use the same, Iwill describe it more in detail.

The nature of my invention consists, iirst, in reducing the inside of the rear part of the bar, as will hereafter be explained; second, in the peculiar mode of fastening1 the ferrule and shank together, as hereafter explained; third, in the combination of a holding-pin with the ferrulc and shank, as hereafter explained.

In the drawings, A is the head or stationary jaw, from which projects the bar B, the rear inner side of which is reduced, as shown at C.

D is the sliding jaw. The rear part, D', is made to fit the reduced part, C, of thebar, while the front part is made to iit the full-sized part, B, of the bar, as fully shown in the drawings.

The rosette-screw E is provided with a rosette, E', to operate the movable jaw D in the usual manner. v

The ferrule F is secured to the shank H by apin, a, which is inserted in ahole in the ferrule F, one-half of the pin a fitting into the shank, as fully shown in Fig. 2. Fin a not only secures the ferrule F to the shank H, but also holds the ferrule from being pressed back against the handle G when the wrench is in use.

In making wrenches with malleable iron bars the heads are liable .to break from the bar in cooling in consequence of the increased amount of metal in the head. A

To obviate this I core out the sides of the head, as shown at b, Fig. l, which reduces the metal to such an extent as to prevent the unl equal shrinkage of the parts named.

By reducing the bar, as shown at C, I save metal witho ut inj uriousl y atfectin g the strength of the wrench. Then, again, a greater amount of metal is obtained below the screw, as shown at c, which adds to'the strength of this part of the wrench, which is very liable to break out, as heretofore made.

As the sides of the bar are made parallel to each other, and the movable jaw is made to cover the break d, the appearance of the wrench is quite as neat and attractive as it would be if the bar were of uniform size the whole length.

Having described my improvements in screw-wrenches, what I claim therein as new and of my invention, and desire to secure by Letters Patent, is-

1. The combination, with the reduced bar, as shown at C, ofthe sliding jaw D, substantially as and for the purposes set forth.

2. The combination, with the ferrule F and shank H, of the holding-pin a, substantially as and for the purposes set forth.

3. A combined head and bar, cast in one piece, with the head cored out, as shown at b, for the purposes stated.

GEO. C. TAFT.

Witnesses;

THos H. DODGE, D. L. lVIILLER. 

